What are the donation services?

Question

Computer networks

I met one that is often hung in the form of badges on github, but now I can’t find it.
+
some allow you to do the same with paypal
ps
I only found this about donations from paypal: https://www.paypal.com/webapps/mpp/get-started/don...
(but the page was not found there)

Answer 1

https://flattr.com/